It's a tough call. On the one hand, clearly the conduct here -- both during and after the rape -- was "related" to the defendants' status as gang members. On the other hand, unless you're going to call any crime collectively committed by gang members as "for the benefit of" the gang" -- so they can giggle and taunt others about it, and feel collectively more brazen about their violations of the law -- it seems a pretty big stretch to say that was transpired here was designed to benefit the gang.